How can select from Mysql using alamofire and php in swift

Question

I try to get data from mysql table using php and alamofire in swift, but i can't, this is my code:

 guard
        let useremail = emailTextField.text,
        let password  = passWordTestField.text
    else { return }

    let parameters: Parameters = [
        "useremail": useremail,
        "password": password
    ]
    let api = URL(string: "anyurl/Authentication.php")
 
    AF.request(api!, method:.get, parameters: parameters).responseDecodable(of: SignIn.self) {  response in
        print(response.data as Any)
        if  let data = response.data {
           
            guard let dataDecoded = try? JSONDecoder().decode(Reponse.self, from: data) else {
                print("An error taked place")
                return
            }
            if dataDecoded.error == false {
                print("it is done")
            }else {
                print("it isn't done")
            }
        }
    }

SignIn:

struct SignIn: Codable {
    let useremail: String
    let password: String
}

Reponse:

struct Reponse: Codable {
let error: Bool
let message: String

}

PHP:

 <?php
include_once ('Connection.php');
 
$name = $_POST['username'];
$password = $_POST['password'];


$sql = "SELECT username, password from user where useremail = '$useremail' AND  password ='$password'";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    $response['error']=false;
    $response['message']="New record created successfully";
} else {
    $response['error']=true;
    $response['message']="Error: " . $sql . "<br>" .     mysqli_error($conn);
}
echo json_encode($response);
$conn->close();
?>

note, that i use the same code for INSERT and it is done successfully. in previous code, I always get (An error taked place)